A radioactive decay chain ends with the nucleus 84216Po{}^{216}_{84}\mathrm{Po}84216Po. Along the chain, a total of four alpha particles and two beta-minus particles are emitted.
The table gives four suggestions for the mass number and atomic number of the nucleus at the start of the chain.
| suggestion | mass number | atomic number |
|---|---|---|
| 1 | 200 | 78 |
| 2 | 232 | 90 |
| 3 | 232 | 92 |
| 4 | 232 | 94 |
Which suggestion is correct?
suggestion 1
suggestion 4
suggestion 3
suggestion 2